Casings for a roller or bolt in a sliding door fitting

ABSTRACT

This invention relates to casing for rollers or bolts for use in sliding door fittings. Such casings may be in the form of a major segment of a circle with the bounding chord located along the edge of the sliding door. In order to fit these casings without screws the outer sidewall has previously been made with elastically deformable toothing, but this itself has led to difficulties in removing the casing. In order to make the casing capable of revolution through 90* and still have a clearance between the bounding chord and the edge of the aperture in the door edge, the bounding chord is made shorter than the side of the inscribed square to the circle, i.e., the height of the arc of the segmental casing is not more than 86 percent of the diameter of the circle.

United States Patent [191 Lauterbach [54] CASINGS FOR A ROLLER OR BOLTIN A SLIDING DOOR FITTING [75] Inventor: Heinrich Lauterbach, Nurnberg,

Germany [73] Assignee: Trola Kunststofferzeugnisse Gesellschaft mitbeschrankter Hattung & Co., Nurnberg, Germany [22] Filed: Feb. 5, 1971[21] Appl. No.: 112,866

[30] Foreign Application Priority Data March 17, 1970 Germany ..P 70 09771.6

[52] U.S. Cl ..292/337, 292/23, 292/DIG. 46 [51] Int. Cl ..E05c 9/00[58] Field of Search.....292/337, DIG. 46, l, 23, 252; 308/245 [5 6]References Cited UNITED STATES PATENTS 3,479,074 11/1969 Schlage ..292/l[451 Jan. 9, 1973 FOREIGN PATENTS OR APPLICATIONS 171,938 12/1921GreatBritain ..292/337 1,285,912 12/1968 Germany ..292/DlG.46

Primary Examiner-Robert L. Wolfe Attorney-Holman & Stern [57] ABSTRACTThis invention relates to casing for rollers or bolts for use in slidingdoor fittings. Such casings may be in the form of a major segment of acircle with the bounding chord located along the edge of the slidingdoor. In order to fit these casings without screws the outer sidewallhas previously been made with elastically deformable toothing, but thisitself has led to difficulties in removing the casing. In order to makethe easing capable of revolution through 90 and still have a clearancebetween the bounding chord and the edge of the aperture in the dooredge, the bounding chord is made shorter than the side of the inscribedsquare to the circle, i.e., the height of the arc of the segmentalcasing is not more than 86 percent of the diameter of the circle.

4 Claims, 3 Drawing Figures PATENTEDJAN 91m 3.709.541

uvvuvrox HEINRICH LAIIIERBACH CASINGS FOR A ROLLER OR BOLT IN A SLIDINGDOOR FITTING The invention relates to a casing for a roller or bolt in asliding door fitting said casing having a chamber in which the rollermay be mounted or the bolt guided, and the space having a contour in theform of a segment of a circle and is covered on its outwardly directedside by a plate. The sidewall surface of the segmented contour ispreferably toothed.

Casings of this known kind are fitted by insertion into recessespreviously formed in the edge region of the sliding door in such amanner that the bounding chord of the circular segment of the casingcoincides with the edge of the sliding doorqln an earlier form ofconstruction the casing was secured in this position by means of screws.

Apart from the additional expense entailed by at least two screws percasing, the additional labor required for fastening in this manner,namely the predrilling of the sliding doors and screwing-in at least twoscrews per casing, was however found to be disadvantageous. Furthermore,it has been found that casings secured by screws in this manner are notsufficiently secure in operation, since on the shrinkage of the wood oras the result of mechanical stresses the screws may become loose andfinally be completely detached during the sliding of the door, so thatthe easing falls out and the furniture fitting is not usable until it issegmented.

This recently led to the development of casings which are made ofplastics materials and in which part of the sidewall of the chamberreceiving the roller or bolt is provided with elastically deformableexternal toothing. Given suitable dimensions of the recess provided toreceive the casing, it is thus possible for the casing to be driven intothe recess by only a few light blows, while the teeth of the externaltoothing bend over and firmly wedge the casing in the recess without anyfastening by special retaining means, such as screws being required.

It has however now been found that in this more recent construction itis very difficult to remove the casing from the sliding door, forexample when this is necessary because of a defect, and that this can infact be done in almost all cases only by damaging the sliding doorand/or the casing. The invention is intended to provide a remedy in thisconnection, that is to say to provide a casing which can be removedwithout difficulty, while being equally well secured in the fittedposition as known constructions.

The casing according to the invention is characterized in that theheight of the arc of the circular segmental casing amounts to not morethan 86 percent of the diameter of the corresponding complete circle,that the sum of the arc height and the projection of the roller issmaller than the diameter of the corresponding complete circle, and thatat least the plate is provided with abutments for the detachablecoupling of the easing to a tool by means of which the casing can beturned in the recess receiving it.

This development is based on the realization that because of itscircular segmental shape the casing can be turned in the recess andthereby brought into a position in which part of the sidewall of thespace receiving the roller or bolt and constituting the adhering surfaceprojects freely upwards out of the recess and beyond the edge of thesliding door so that the adhering surface and the pressure appliedthereby are reduced and-the casing can be removed from the recess.

The chord of the circular segment of the casing moves inwards into therecess when the casing is turned and it is important that after turningthrough this chord should still just have a point of intersection withthe opening of the recess, or that twice the length of the are cut offthe arc cutoff and moving into the recess when the casing is turnedthrough 90 the are which on the turning of the casing through 90 movesout of the recess and projects freely beyond the edge of the slidingdoor) is slightly greater than r 1r.

These realizations are embodied in a first feature of the invention,according to which the height of the arc of the circular segmentalcasing should not amount to more than about 86 percent of the diameterof the corresponding complete circle. This may be calculated fromconsideration of the square inscribed in a circle. The further featureof the invention, according to which the sum of the arc height and theprojection of the roller is smaller than the diameter of thecorresponding complete circle, ensures that the casing will be free toturn in its recess without being hindered by the roller. The thirdfeature, according to which at least the plate is provided withabutments for the detachable coupling of the casing to a tool,facilitates the turning of the casing in its recess.

In further development of the invention the abutment provided on theplate comprises two bores spaced apart from one another. The diameter ofthese bores is advantageously slightly larger than the diameter of thepins of a tool which is known in itself and which is suitable fortransmitting torque, so that after its pins have been inserted into thebores of the plate said tool need merely be turned in order to turn thecasing in its recess.

A preferred example of theembodiment of the invention is illustrated inthe drawings, in which:

FIG. 1 shows a roller casing and a bolt in the fitted position.

FIG. 2 a roller casing after being turned through 90 to the positionpermitting removal of the casing, and

FIG. 3 is a rear view of a roller casing according to FIGS. 1 and 2.

The construction of the casings l illustrated in FiGS. l and 2 in therecesses provided to receive them can be seen particularly in FIG. 3. Acasing l of this kind contains a space on chambers 5 which has the shapeof a segment of a circle and is bounded at the rear by a real wall 2, atthe side by a preferably externally toothed sidewall 3, and at the frontby a plate 4 and in which a roller 6 is mounted or a bolt 7 is guided.The toothed contour cooperates with the side of the recess to provide aresistance for preventing accidental turning of the casing. The teethare shown in FIG. 3. In the case of the bolt casing l the plate 4 has aslot 8 to guide an adjusting wedge 9 serving for the displacement of thebolt 7.

Whereas in FIG. I the chord 10 of the circular segment 1 of the casingcoincides with the edge 11 of the sliding door, which is only partlyindicated, in FIG. 2 it extends perpendicularly thereto. The casing 1has been turned into this position by means of a plier-like tool whichis provided on the side of each of its jaws with a pin, these pins beingadapted to be inserted into bores 12 in the plate 4; when this tool isturned the casing 1 must follow this movement.

Since in the position of the casing 1 shown in FIG. 2 the completecircle corresponding to the circular segment 1 of the casing has onlyless than 50% of its circumference bearing against the sidewall 13 ofthe recess, and since in addition a slight clearance exists between thechord of the circular segment 1 of the casing and the line ofintersection 14 (shown on the right in the drawing) of the sliding dooredge 11 and the sidewall 13 of the recess, and also between theintermediate roller 6 and the side wall 13 of the recess, the casing 1can be displaced slightly to the right and downwards, so that it is freeon all sides from the sidewall 13 of the recess and can withoutdifticulty be lifted out of the latter.

In order to achieve a clearance between the chord 10 and thecorresponding gap in the edge 11 after the casing has been turned, it isnecessary for the length of the chord to be greater than the length ofthe side of a square inscribed in the complete circle corresponding tothe circular segment. A condition for this is that h, the height of thearc of the segment, should be less than (2 r2 )/4 X d the diameter ofthe complete circle. This can be alternately expressed approximately as86 percent of the diameter of the complete circle. The project p of theroller must clearly be such that h p is less than d, or the rotationthrough 90 would not be possible In the preferred example of embodimentof the invention illustrated in the drawing the plate 4 extends beyondthe side-wall 3 of the space; the casing 1 can thus be supported on thesliding door surface by means of the laterally projecting portion of theplate, thus providing the advantage that the recess receiving the casingl is completely covered. If, however it is desired that the casing 1should for example be mounted flush in the recess, it is advisable toomit the laterally projecting portion of the plate, so that theperipheral line of the plate 4 coincides with the sidewall 3 of thespace 5.

I claim:

1. A casing for a roller or bolt of a sliding door fitting which casingcontains a chamber which has a sidewall in the form of a major segmentof a circle to be rotatably received in a similarly shaped recess havinga mouth formed in the edge of the door and is covered on its outwardlydirected side by means of a plate, the chamber being adapted to receivea projecting roller, or a bolt, at least the plate being provided withabutments for the detachable coupling of the casing to a tool, the sumof the arc height and projection of the roller being smaller than thediameter of the corresponding complete circle, whereby the casing can beturned by means of said tool, in the recess receiving it, from a firstposition, in which the chord of the segment formed by the sidewallcoincides with the edge of the door and the roller or bolt projectsbeyond the edge of the door, to a second position, in which the saidchord is perpendicular to the edge of the door; the height of the arc ofthe circular segment amounting to not more than 86% of the diameter ofthe corresponding complete circle, whereby when the casing is in saidfirst position it is secured against movement out of the recess, butwhen the casing is in said second position, it can be withdrawn from therecess through he mouth thereof.

2. A casing according to claim 1, characterized in that the abutmentprovided on the plate comprises two bores spaced apart from one another.

3. A casing according to claim 2, characterized in that the diameter ofthe bores is slightly greater than the diameter of the pins of a toolwhich is known in itself and which is suitable for transmitting torque.

4. A casing according to claim 1, characterized in that the sidewall hasa toothed contour for cooperating with the side of the recess forproviding a resistance for preventing accidental turning of the casing.

1. A casing for a roller or bolt of a sliding door fitting which casingcontains a chamber which has a sidewall in the form of a major segmentof a circle to be rotatably received in a similarly shaped recess havinga mouth formed in the edge of the door and is covered on its outwardlydirected side by means of a plate, the chamber being adapted to receivea projecting roller, or a bolt, at least the plate being provided withabutments for the detachable coupling of the casing to a tool, the sumof the arc height and projection of the roller being smaller than thediameter of the corresponding complete circle, whereby the casing can beturned by means of said tool, in the recess receiving it, from a firstposition, in which the chord of the segment formed by the sidewallcoincides with the edge of the door and the roller or bolt projectsbeyond the edge of the door, to a second position, in which the saidchord is perpendicular to the edge of the door; the height of the arc ofthe circular segment amounting to not more than 86% of the diameter ofthe corresponding complete circle, whereby when the casing is in saidfirst position it is secured against movement out of the recess, butwhen the casing is in said second position, it can be withdrawn from therecess through the mouth thereof.
 2. A casing according to claim 1,characterized in that the abutment provided on the plate comprises twobores spaced apart from one another.
 3. A casing according to claim 2,characterized in that the diameter of the bores is slightly greater thanthe diameter of the pins of a tool which is known in itself and which issuitable for transmitting torque.
 4. A casing according to claim 1,characteriZed in that the sidewall has a toothed contour for cooperatingwith the side of the recess for providing a resistance for preventingaccidental turning of the casing.